HIGH TEMPERATURE LACTAM NEUTRALISATION

WIPO Patent Application WO/2012/019674

A3

The invention relates to a method for preparing a lactam in a continuous process, comprising forming the lactam and ammonium sulphate by contacting a lactam sulphate contained in an acidic liquid with ammonia, during which forming of lactam heat of reaction is generated, which heat is partially or fully recovered, wherein ammonia is brought into contact with the acidic liquid as part of a liquid aqueous ammonia solution, and wherein the contacting takes place at a temperature of at least 120 °C, and wherein the average residence time at a temperature of at least 120 °C is at most 15 minutes, and wherein the ammonium sulphate remains dissolved in a liquid phase during said residence time.

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OEVERING HENDRIK (NL)
GUIT RUDOLF PHILIPPUS MARIA (NL)
BAUR HENRICUS ANNA CHRISTIAAN (NL)

PCT/EP2011/003281

April 05, 2012

July 01, 2011

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DSM IP ASSETS BV (NL)
OEVERING HENDRIK (NL)
GUIT RUDOLF PHILIPPUS MARIA (NL)
BAUR HENRICUS ANNA CHRISTIAAN (NL)

C07D201/16

US4021422A

1977-05-03

DUFFY, Jim (MA Geleen, NL)

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